Observation method of multi-stage depressurization water injection based on fracture observation

Abstract

The invention discloses a fracture observation-based observation method for multi-stage step-down water injection. The used device includes a test probe, a propulsion system and a control system. The test probe includes an occluder, a partial pressure assembly and a connecting pipe. A water injection cavity is formed between the occluder and the borehole. The partial pressure assembly is installed at the tail of the front occluder and the middle occluder. Composed of a device and a secondary converter, the high-pressure water source in the connecting pipe is converted in stages to the low-pressure water source flowing into the water injection cavity for detection. The occluder includes a leaking pipe, a rubber bag and a joint. The rubber bag is wrapped around the outside of the leaking pipe, fixed on both ends of the joint by a fastening ring, and forms a sealing cavity with the leaking pipe. The test device uses the same external water source to realize the plugging process and the detection process to work under their respective pressures, and to make the pressure conversion stable, to integrate the plugging and side leakage systems, and to solve the problem of drilling pipe and hose winding during the propulsion process , At the same time, it can realize multi-segment measurement each time, and improve the measurement efficiency.

Description

technical field [0001] The invention belongs to the technical field of rock mass permeability measurement, and in particular relates to an observation method for multi-stage graded depressurization water injection based on fracture observation. Background technique [0002] The measurement of the depth of the mining fracture zone in the mine floor is an important parameter to indicate the occurrence state of coal and rock. It is a key basic parameter in the study of mine water prevention and control. Therefore, in order to study the formation of water-conducting channels in mining surrounding rocks, it is necessary to grasp the law of rock movement and determine the height of mining damage zones. The on-site detection adopts a series of detection equipment represented by "double-end plugging leak detection device". There are multiple operation and control systems connected to the external terminals, and there are at least 2 or more pipelines in the corresponding interior. Th...

AI Technical Summary

Problems solved by technology

The on-site detection adopts a series of detection equipment represented by "double-end plugging leak detection device". There are multiple operation and control systems connected to the external end, and there are at least 2 or more pipelines in the corresponding interior. The operation process is cumbersome and There is a winding problem, and the stability is poor during the observation process

In the series of products, although the single circuit problem can be solved, there is a large range of water pressure conversion, the conversion process is not stable, it is not suitable to control the water pressure, and it is easy to cause mechanical failure. The existing technology cannot solve the above problems at the same time.

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